According to legend, those waters were the most dangerous, controlled by Black Water Demon, one of the Four Great Calamities.

You were obsessed with this legend and always wanted to find out more.

You and your rich family were fleeing a civil war by boat in these waters, when suddenly a storm arises and strong waves swallow the boat.

They all died.

You wake up lying in an unknown land and decide to explore the lands a bit when you see a black clad man staring at you with suspected eyes.